Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for obtaining pet crystal energy peak value and setting energy discriminator

An energy value, crystal technology, applied in the field of PET imaging, can solve the problem of unable to provide the best energy peak of crystal, achieve high iterative convergence speed, speed up, improve authenticity and accuracy

Active Publication Date: 2017-06-06
SHANGHAI UNITED IMAGING HEALTHCARE
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on the above, it can be seen that in the PET system, setting an appropriate LLD threshold for the low-energy discriminator means that it is necessary to seek the optimal energy peak based on the photon energy of the PET crystal. The existing technology cannot provide a method that can obtain the optimal energy of the crystal. peak method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for obtaining pet crystal energy peak value and setting energy discriminator
  • Method for obtaining pet crystal energy peak value and setting energy discriminator
  • Method for obtaining pet crystal energy peak value and setting energy discriminator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] The technical solution of the present invention is different from the prior art. The LM (Levenberg-Marquardt) algorithm is used to fit the crystal energy distribution curve to obtain the energy distribution and energy peak of the PET crystal. In the fitting process, the technical solution of the present invention first Perform energy spectrum statistics, estimate the initial value of the crystal energy distribution model (primary fitting parameters) based on the crystal energy spectrum, and evaluate the fitting process in combination with the goodness of fit. When the first fitting result meets the preset goodness of fit conditions The iterative calculation can be stopped and the iterative process can be optimized.

[0045] Based on the above, the technical solution of the present invention can be realized based on the following three means:

[0046] The LM algorithm is used to fit the crystal energy distribution model, and the gradient algorithm can be used to find the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for obtaining a PET crystal energy peak value and a method for setting an energy frequency discriminator. The method for obtaining the PET crystal energy peak value comprises the steps of establishing an energy distribution model of a PET crystal and acquiring PET original data, performing PET crystal energy spectrum statistics based on the PET original data so as to obtain initial fitting parameters of the energy distribution model of the PET crystal, adopting an LM iterative algorithm to calculate the fitting parameters of the energy distribution model based on the energy distribution model and the initial fitting parameters so as to obtain the energy distribution of the PET crystal, and completing PET crystal energy peak value recognition according to the obtained energy distribution of the PET crystal. By means of the technical scheme, the optical PET crystal energy peak value can be obtained.

Description

technical field [0001] The invention relates to the technical field of PET imaging, in particular to a method for obtaining the energy peak value of a PET crystal and a method for setting an energy discriminator. Background technique [0002] PET (Positron Emission Computed Tomography, Positron Emission Computed Tomography) system is the fastest-growing imaging technology in the field of nuclear medicine today, and is widely used in clinical testing. [0003] In PET systems, scintillation crystal detectors are widely used to detect gamma rays. The rays are excited in the scintillation crystal material through Compton scattering or photoelectric absorption to emit visible light. The photoelectric amplification output of the multiplier tube. [0004] The pulse signal generated by the photomultiplier tube is received and processed by a differential discriminator at the same time. The differential discriminator includes a low energy discriminator (LLD) and a high energy discrim...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
Inventor 马润霞吕新宇
Owner SHANGHAI UNITED IMAGING HEALTHCARE